Production of expanded sheet metal



I Nov. 17,1925- H. M. GER SMAN PRODUCTION OF EXPANDED' SHEET METAL Origidal Filed May 27,1921

Patented Nev n I925. I I I I I v I U IT D STATES PATENT,- QF'FICE;

nnnvnr mftinnsmen; or cn'rckeo, xrlnmors. rnoiiiiorroir or nxre 'vnnnsnnnr mnrAt.

Original application flledMay 27, 192 1, Serial No. 47%9621. Divided and this application filed June 1, v v s. I 1923. seriarn' 542,871 j v To all whom it ma-y concern; Y tlle k lnds of the adjacent slits of each row Be it known that I, HARVEY MLGERsMAN; 'andbetween the alining slits of the alternate a citizen of the United States,'resid1ng at rows.

Chicago, in the county of Cook and State of By the present 'ineth'od the blank, which ,Illinois, have invented a new and useful, to startwith is flat and provided with the Improvement in the Production of Expand slits} described is, formed withlongitudinal .ed Sheet Metal, of which the following is a corrugations,f thatjis' to say corrugations specification. I which are normal to the slits, and these are This application is filed as adivision of so arranged th'at the alternate longitudinal my application, 'Serial No. 473,062 'filed rows of jur nition portions are oflset re'lative- 5- May 2'], 1921, in so far as concerns the sub- 1y toi therimearr plane of the sheet whereby ject matter 0t claims cancelled from said the junction portions of rows B lie at one application pursuant to the divisional re -1 side ,of said mean plane and the junction qui-rement therein made. I V v i- ,vporti o ns'-of rows A lie at the opposite side of v This invention relates tothe production @said mean plane.- The junction portions.

"'of expanded sheet metal and 'ts principall form lithe apices of the corrugations and object is to provide a method 'ofL siinple" are presented flat or substantially so where- .characterfor the production ofexpanded ,by the j portions of. the metal which consheet metal having novelstructural teatures/ nect the junction portions of adjacent rows and noveland superior qualities, such e'x-' extend athwart the mean plane of the pandednietal forming the subject ofr'ny co-- blank-at a well defined. angle to such juncpendingapplication SeriaLNo."64248701.- tioliportions.

. ,The manner of 'practicing the invention he ,method preferably includes the forwill be apparent from theyaccb'mpanyhg' .mation of minor corrugations inverse and drawing, tak in connection with the do. a P scription hi h f l l I p aralleltothe corrugations above described t-(an d which may bedesignated asmaj or y In said drawingi a v corrugations) and within which the junc: Figures 1 and 2, respectively, are plan and tion "p0rtions12'lie; the minor corrugations edge views of the blankfina form prescribed" being indicated at 14 in Figures land 2;

i -by the present method.

' of Figure 1,

Figure 3 is a detailedplanview of the eX- ployed the slits are extended slightly at their panded sheet metal producedrfromthe blank ends into the portions in which the minor corrugations are formed. By virtue of the Figures i land 5 are detailed sectional minor corrugations the webs or junction viewsin the'planes 44 and 5- 5 re'specportions"12 are transversely. concave and 9 t-ively, of Figure 3. a r ridges 15 are formed in the parts which In the expanded metal the ,strands'll and extends transversely between the junction the. webs or connecting portions '12 delimit portions of adjacent rows, the said ridges e x hexagonal cells or voids 13'and, as in the tending longitudinally of the sheet and ordinary expanded metal lathing, the hexagtransversely of the parts in which they are onal form of the cells is such that they are formed and lying near the extremities of the I 7 arranged in parallel rows whose axes are slits. I

pear by the alternately arranged broken of the present method, the form above delines A and B. L "scribed and shown in Figures 1 and 2, is ex- The blank from which the expanded metal pandediin the usual manner to produce the is produced is provided withv slits which finished product shown in Figure 3. The

" aline in the direction of their length and are location of the ends of the slits 1n the blank thereby arranged in rows disposed tr'ans with reference to the longitudinal centers of versely of the sheet, the slits of one row the webs as indicated by the lines C, that is being arranged in staggered or break-jointto saythe central axes of the webs at right position relatively to the slits of adjacent angles to the axes of the rows A and B, in rows; and the webs or junction portions of conjunction with the provision of the major -the expanded metal are substantiallypm corrugations determines the planes of the i rided Bjthe material which lies between Y webs the expanded sheet. In the ex-.1

and where the minor corrugations are ema normal to and bisect the parts12 as will ap- The blank havingj byvirtue of the steps 7 pended sheet the major ;cori'ugationsare maintainedand the junction portions of the alternate rows lie in. relatively the same pla nes as in the blank. Thebest results are obtained by having the central portionsof the webs of'rows at the same side-of the sheet in a--common'-planewand for. this pur- I posexthe, ends oil-the slits inthe blank tel" minate in coincidence with the longitudinal centers ef the webs. However, results substantiallybetter in degreethan is possible with expanded lathin-g of the ordinary construction may be obtained, within the scope and contemplation of the invention, in various cases where the slits are so arranged that the Wales or junction portions of the ex? .panded sheet will lie at an angle to their mean planes, the value" of the. results in- 'junction.portions .ofithe expanded. metal are truly flat throughout their extent the best results are obtained where, as shown,

the junction portions are substantially flat relativelyto the mean plane of the sheet While yet 'being Slightly conoave'in .the

' transverse direction of the sheet, that is tov say the direction at right angles to the rows A and B,-and the strands'are formed with ridges 15' extending transversely thereof and closely adjacent their lines of union with the junction portions. As the blank is expanded the strands are bent laterally away from the junction portions. from which. they extend and aredeformed along the ridges/l5 so -as to provide the, ridges 15 in-the finished sheet; 40-

Theridges 15 increase in height from their mean to their extreme ends and, being produced by the deformation of the strands consequent to the expansion of the blank, prevent the development of stresses] incident to such expansion which might sheet metal which consists in slitting theblank, the slits being arranged in parallelotherwise result in the partial rupture of the strands along or substantially along their lines of union With. the junction portions.

It-follows. that by virtue of the minor corrugations 14 the slits may be made longer with resultant larger voids" in the expanded metal than would other-Wisebe possible; In

thisway a greater degree of expansion with a consequent reduction in weight is secured' while at the same time the strength of. the expanded metal sheetis not impaired. In

' fact the rid es 15 serveas reinforcements.

ness and sheet.

for the stran sand tend to increasethestifi pressure resisting quality of the In jthe expanded'sheet the strands. ex-

' tend in I inclined 'or angular directions athwart the mean plane of the sheetan'd' present. the reatest effective area to resist the thrusts incident to "the application of the plaster This will be apparent when it of the adjacent rows, formin wearer substantially coinoidewith lines parallelgto thev axes of the rows A and B in the mean plane of the sheet; The depths of the jor corrugations will begsuch as'toinsur is considered that the planes of the strandsgood clinching and keying effects while at j the same time all, or nearly all of the area of the webs and the strands is utilized to resist-the thrusts incident to the applies--- tion of the'plaster, theneb'yfavoiding cutting through the, pl'asterandln inifmizing I i the loss and vWaste of plaster 4' by z 'lseepagge.

If desired the major corrugationsimay made -'sufiic1ently deepto serve asiturring strips at either side of," the sheet, a self vfurring quality beingthereby provided,

fHaving'ffully describe claim: f

.; 1; The 'methoaQtffls ucing sanded sheet metal which consists in slitting the blank, the sli ts'being arranged in parallel sheet metal which consists in slitting the v blank, the slits being arranged i i-parallel y inve tion, I

p I 2. ,Themethod of producing" expanded expanding the blanksoslitted and: corru-- transverse rowswith the slitsof .one row of the adjacent rows, longitudinally corruin break-joint position relatively to' theslits gating the blank to offset the rows vOii junction portions alternately at opposite sides I of the mean plane of the sheet and locating the ends of the slits relativelyto the central .axes of the junction portions so ascto determine'theplanes of the junction portions in the expanded sheet and'expanding the blank so slittedand corru' ated.

transverse rows with the slits, of'o ne row in break-joint position relatively to the slits longitudinal rnaj or corrugations in the blan whereby the junction portions are ofiset relatively to 3. The method of pro ucing expanded the mean. plane of the sheet in ,parallel longitudinal. rows, forming minor corrugations in the blank inverse and parallel to the major corrugations and in whi-ch the junction portions "lie and into which the slits extend slightly at their ends, and expanding the blank so slittedand corrugated. 4. The method of producing expanded sheet metal which consists in slitting the blank, the slits beingarranged in parallel transverse rows with the slits of one row in break-joint position relatively to the slits of adj acent rows, longitudinally corrugat- .ing the blank whereby the parts which 0011 tion portions at an agle to the direction in which they extend athwart the mean plane of the blank. I

5. lhe method of producing expanded sheet metal which consists in slitting the blanlgjthe slits being arranged in parallel transverse rows-with the slits of one row in break-joint position relatively to the slits of adjacent rows, forming longitudinal major corrugations in the blank whereby the parts which connect the junction portions extend at an angle thereto and to'the' mean plane of the blank, forming minor corrugations in the blank inverse and para1- lel to the major corrugations and in which the junction portions lie and into which the slits extendslightly at their ends, and expanding the blank so slitted and corru gated.

In testimony whereof I afiix my signature.

HARVEY M. GERSMAN 

